A Chicago teen has been charged for stabbing an Uber driver to death in a random attack using a knife and machete she just allegedly stole from Walmart.

According to the Chicago Tribune, Uber driver Grant Nelson, 34, had picked up 16-year-old Eliza Wasni on Tuesday a few blocks from a Walmart. Just minutes into the ride, Wasni allegedly began stabbing the driver. According to the report, Nelson pulled over his car and ran to a nearby condominium lobby, pushing buttons frantically while calling for help.

Prosecutors called the act "heinous" and "not provoked in any manner” in court on Wednesday, while Wasni kept her eyes mostly to the floor as the judge ordered her held without bail.

Authorities say Wasni took off in Nelson's car after stabbing him. She hit a median, ran off on foot, and was later found nearby reportedly wearing only a bra and leggings. A bloodstained Chicago Cubs shirt was found nearby. Police were also able to use the Uber app on the victim’s phone to see that "Eliza" was the name of his most recent customer.

Nelson, a University of Colorado at Boulder graduate, was able to describe his attacker to police before he died at a nearby hospital. Surveillance footage from Walmart allegedly showed Wasni walking around with both a knife and machete and leaving without paying for them, the prosecutor said Wednesday.

According to the Washington Post, Wasni lives with a single mother and is a student at Taft High School in Chicago. She was in violation of Uber’s 18-and-older age restriction for riders.